/Engine/Source/Developer/MaterialUtilities/Public/MaterialUtilities.h
Compute the required texture size to achieve a target texel density, given the world to UV space ratio.
The texture size needed to achieve the required texel density.
static int32 GetTextureSizeFromTargetTexelDensity ( double InMesh3DArea, double InMeshUVArea, double InTargetTexelDensity )